# -*- coding: utf-8 -*-
"""
Created on Mon Dec 25 14:29:27 2023

@author: xiang
"""
import numpy as np
xi=1
for i in range(20):
    xi = np.sqrt(2*xi+3)
    print(xi)
    
    
    
import numpy as np
xi=0
for i in range(20):
    xi = (xi**2-3)/2
    print(xi)
